I\'ve experienced the same with Home Studio 2004Xl and Cubasis. In 2004, there is a panic button in the tool bar that so far has worked every time. In Cubasis, the only way I have been able to \"turn\" the notes \"off\" is to literally shut down then restart my controller. (Not the software) And again, so far this has worked without damaging my work. One explanation was given by an IT exert who claims we may be giving and \"overlap\" of commands causing a conflict as to whether the note should be off or on. Hmmm.